WordReference Random House Learner's Dictionary of American English © 2020
ˈmas•ter ˌkey, n. [countable]
  • Buildinga key that will open a number of different locks.

  • WordReference Random House Unabridged Dictionary of American English © 2020
    master key′, 
  • Buildinga key that will open a number of different locks, the proper keys of which are not interchangeable.
    • 1570–80

    Collins Concise English Dictionary © HarperCollins Publishers::
    master key n
    1. a key that opens all the locks of a set, the individual keys of which are not interchangeable
      Also called: pass key
    'master key' also found in these entries:
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